INFO: task syz-executor285:8083 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor285 D27656 8083 8081 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 fuse_wait_on_page_writeback fs/fuse/file.c:383 [inline] fuse_wait_on_page_writeback.isra.0+0x11b/0x170 fs/fuse/file.c:379 fuse_launder_page fs/fuse/file.c:2033 [inline] fuse_launder_page+0xb6/0xe0 fs/fuse/file.c:2026 do_launder_page mm/truncate.c:655 [inline] invalidate_inode_pages2_range+0x795/0x1110 mm/truncate.c:725 fuse_finish_open+0x2e2/0x590 fs/fuse/file.c:182 fuse_open_common+0x254/0x2c0 fs/fuse/file.c:222 do_dentry_open+0x4aa/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0x793/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f4a0d39c4c9 Code: Bad RIP value. RSP: 002b:00007f4a0d34d2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f4a0d42d4c0 RCX: 00007f4a0d39c4c9 RDX: 0000000000000300 RSI: 0000000020000100 RDI: 00000000ffffff9c RBP: 00007f4a0d3fa164 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 00007f4a0d3f6158 R14: 00007f4a0d3f8160 R15: 00007f4a0d42d4c8 Showing all locks held in the system: 1 lock held by khungtaskd/1569: #0: 000000007449e919 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by systemd-journal/4689: #0: 00000000072efa8f (&rq->lock){-.-.}, at: idle_balance kernel/sched/fair.c:9702 [inline] #0: 00000000072efa8f (&rq->lock){-.-.}, at: pick_next_task_fair+0x556/0x1570 kernel/sched/fair.c:6841 1 lock held by in:imklog/7801: #0: 000000000dc5b557 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by syz-executor285/8083: #0: 00000000edf9f949 (sb_writers#11){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000edf9f949 (sb_writers#11){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 #1: 00000000b1410c58 (&sb->s_type->i_mutex_key#17){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #1: 00000000b1410c58 (&sb->s_type->i_mutex_key#17){+.+.}, at: fuse_open_common+0x1bc/0x2c0 fs/fuse/file.c:215 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1569 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 10 Comm: rcu_preempt Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:784 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:806 [inline] RIP: 0010:__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] RIP: 0010:_raw_spin_lock_irqsave+0x2c/0xc0 kernel/locking/spinlock.c:152 Code: c0 80 82 f1 89 41 54 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 55 48 89 fd 80 3c 10 00 75 7f 48 83 3d 47 35 d8 01 00 74 71 9c <58> 0f 1f 44 00 00 48 ba 00 00 00 00 00 fc ff df 49 89 c4 48 c7 c0 RSP: 0000:ffff8880b5a67d28 EFLAGS: 00000286 RAX: 1ffffffff13e3050 RBX: ffff8880b5a67e80 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffff8880b5a67e80 RDI: ffffffff89f88698 RBP: ffffffff89f88698 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89f88698 R13: ffffffff89f886d0 R14: ffff8880b5a67e90 R15: ffff8880b5a67e80 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f05005e4028 CR3: 00000000a1219000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ---------------- Code disassembly (best guess): 0: c0 80 82 f1 89 41 54 rolb $0x54,0x4189f182(%rax) 7: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx e: fc ff df 11: 48 c1 e8 03 shr $0x3,%rax 15: 55 push %rbp 16: 48 89 fd mov %rdi,%rbp 19: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) 1d: 75 7f jne 0x9e 1f: 48 83 3d 47 35 d8 01 cmpq $0x0,0x1d83547(%rip) # 0x1d8356e 26: 00 27: 74 71 je 0x9a 29: 9c pushfq * 2a: 58 pop %rax <-- trapping instruction 2b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 30: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 37: fc ff df 3a: 49 89 c4 mov %rax,%r12 3d: 48 rex.W 3e: c7 .byte 0xc7 3f: c0 .byte 0xc0